A general view shows the mountain resort of Andermatt, Switzerland. The prospect of searing heatwaves driving holidaymakers to cool mountains and children asking grandparents about their memories of snow is focusing minds in Alpine ski resorts on the implications of climate change. REUTERS/Arnd Wiegmann

Parts of the Gurschengletscher glacier are covered with tarps near the peak of Mount Gemsstock (2,961 m/ 9,715 ft) in Andermatt, Switzerland. With global warming widely expected to slash snowfall, especially at lower levels, the Swiss tourism industry is looking for ways to preserve a lucrative business brutally exposed to the weather. REUTERS/Arnd Wiegmann

Pictures on a cable car of the Weisshornbahnen promote the Arosa Baerenland sanctuary in the mountain resort of Arosa, Switzerland. The Arosa ski resort in eastern Switzerland has created a$6.5 million refuge hosting Napa and two other bears rescued from cages at restaurants in Albania to help draw summer visitors and reduce its reliance on skiers and snowboarders. REUTERS/Arnd Wiegmann

Parts of the Gurschengletscher glacier are covered with tarps in Andermatt, Switzerland. School classes, families and a group of army veterans celebrating an 80th birthday were visiting one recent summer day, helping the park towards what Arosa tourism director Pascal Jenny said was a target of 50,000 visitors this year. REUTERS/Arnd Wiegmann

A general view shows the Andermatt Swiss Alps resort in Andermatt. Arosa has reinvented itself before - moving to winter tourism in the 1930s after decades as a health resort for tuberculosis patients. But with nearly 620,000 overnight stays in winter last year, more than three times the summer total -- it will not be easy. REUTERS/Arnd Wiegmann

A general view shows the Andermatt Swiss Alps resort in Andermatt, Switzerland. The prospect of searing heatwaves driving holidaymakers to cool mountains and children asking grandparents about their memories of snow is focusing minds in Alpine ski resorts on the implications of climate change. REUTERS/Arnd Wiegmann